linux-kernel - Re: [PATCH v6 1/3] spi/pl022: Add chip select handling via GPIO

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Date:	Sun, 02 Sep 2012 22:04:14 +0200
From:	Roland Stigge <stigge@...com.de>
To:	shiraz hashim <shiraz.linux.kernel@...il.com>
CC:	linus.walleij@...aro.org, aletes.xgr@...il.com,
	broonie@...nsource.wolfsonmicro.com, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, rob@...dley.net,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net,
	gabriel.fernandez@...ricsson.com, lee.jones@...aro.org,
	viresh.kumar@...aro.org, sachin.verma@...co
Subject: Re: [PATCH v6 1/3] spi/pl022: Add chip select handling via GPIO

Hi Shiraz,

On 01/09/12 13:14, shiraz hashim wrote:
> On Wed, Aug 22, 2012 at 7:19 PM, Roland Stigge <stigge@...com.de> wrote:
>> @@ -2016,6 +2030,8 @@ pl022_probe(struct amba_device *adev, co
>>         pl022->master_info = platform_info;
>>         pl022->adev = adev;
>>         pl022->vendor = id->data;
>> +       /* Point chipselects to allocated memory beyond the main struct */
>> +       pl022->chipselects = (int *) pl022 + sizeof(struct pl022);
> 
> This is going beyond memory allocated for chipselects
> as it adds 4 * sizeof(struct pl022) bytes to pl022.
> 
> pl022->chipselects = (int *) &pl022[1];

Correct. Thanks for the heads up!

Funnily, my previous proposal way actually like you just proposed, but
we took the other one since it looked "better". ;-)

I'll provide an incremental bugfix patch since Mark already has the
commit in his misc.git tree.

Thanks again,

Roland
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